 After serving at various Indian stations, the 99th was called to active service to form part of General Sir Hope Grant's force during the Second Opium War.Assigned to the 2nd Division, commanded by Major-General Sir Robert Napier, the 99th took part in the Third Battle of Taku Forts and the Battle of Palikao.The regiment also participated in the Sack of Peking, where among the loot carried off, the regiment took a Pekinese dog that belonged to the Chinese Empress.